dsp28335 pwm实现流水灯，只要.c文件，不需要.h文件，用定时器延时

以下是基于DSP28335的PWM实现流水灯的.c文件代码，不需要使用.h文件，使用定时器延时：

#include "DSP2833x_Device.h"     // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h"   // DSP2833x Examples Include File

// Function Prototypes
interrupt void cpu_timer0_isr(void);

// Global Variables
Uint16 pwm_period = 375;        // PWM周期
Uint16 pwm_duty = 187;          // PWM占空比，即50%
Uint16 pwm_counter = 0;         // PWM计数器，用于计算PWM占空比
Uint16 led_counter = 0;         // LED计数器，用于控制流水灯

void main(void)
{
    // Initialize System Control:
    InitSysCtrl();

    // Initialize GPIO:
    InitGpio();

    // Initialize PIE:
    InitPieCtrl();

    // Disable CPU interrupts:
    DINT;

    // Initialize the PIE vector table:
    InitPieVectTable();

    // Setup CPU Timer0:
    ConfigCpuTimer(&CpuTimer0, 150, 1000000);

    // Set up GPIO for PWM output:
    EALLOW;
    GpioCtrlRegs.GPAPUD.bit.GPIO0 = 1;   // Disable pull-up on GPIO0 (PWM1)
    GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1;  // Configure GPIO0 as PWM1 output
    GpioCtrlRegs.GPADIR.bit.GPIO0 = 1;   // Set GPIO0 as output
    EDIS;

    // Enable CPU interrupts:
    IER |= M_INT1;

    // Enable TINT0 in the PIE: Group 1 interrupt 7
    PieCtrlRegs.PIEIER1.bit.INTx7 = 1;

    // Start CPU Timer0:
    StartCpuTimer0();

    // Loop forever:
    while(1)
    {
        // Do nothing
    }
}

// CPU Timer0 ISR
interrupt void cpu_timer0_isr(void)
{
    // Acknowledge the interrupt
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;

    // Increment PWM counter
    pwm_counter++;

    // Check if PWM counter is greater than PWM duty
    if(pwm_counter > pwm_duty)
    {
        // Set GPIO0 low
        GpioDataRegs.GPACLEAR.bit.GPIO0 = 1;
    }
    else
    {
        // Set GPIO0 high
        GpioDataRegs.GPASET.bit.GPIO0 = 1;
    }

    // Check if PWM counter is equal to or greater than PWM period
    if(pwm_counter >= pwm_period)
    {
        // Reset PWM counter
        pwm_counter = 0;
    }

    // Increment LED counter
    led_counter++;

    // Check if LED counter is greater than or equal to 500,000
    if(led_counter >= 500000)
    {
        // Reset LED counter
        led_counter = 0;

        // Shift LED pattern to the left
        pwm_duty = pwm_duty << 1;

        // Check if LED pattern has shifted beyond 100%
        if(pwm_duty >= pwm_period)
        {
            // Reset LED pattern to 50%
            pwm_duty = 187;
        }
    }
}

以上代码将CPU Timer0配置为1 MHz的计时器，并使用定时器中断来实现PWM输出和流水灯效果。其中，使用了两个计数器pwm_counter和led_counter来控制PWM输出和流水灯效果。在每次CPU Timer0中断时，增加pwm_counter和led_counter的值，然后根据pwm_counter的值来控制PWM输出，根据led_counter的值来控制LED流水灯效果。最后将pwm_duty的值左移一位来实现LED流水灯效果，当pwm_duty的值超过PWM周期时，将pwm_duty的值重置为50%。